//创建一个静态方法 返回一个窗体对象
public static Singobject Getsing()
{
if (_single == null)
{
_single = new Singobject();
}
return(_single);
}
private void button4_Click(object sender, EventArgs e)
{
if (Singobject.Getsing().f5 == null)
{
Singobject.Getsing().f5 = new Form5();
}
Singobject.Getsing().f5.Show();
}
private void button3_Click(object sender, EventArgs e)
{
if (Singobject.Getsing().f4 == null)
{
Singobject.Getsing().f4 = new Form4();
}
Singobject.Getsing().f4.Show();
}
private void button2_Click(object sender, EventArgs e)
{
if (Singobject.Getsing().F3 == null)
{
Singobject.Getsing().F3 = new Form3();
}
Singobject.Getsing().F3.Show();
}
private void Form3_FormClosing(object sender, FormClosingEventArgs e)
{
Singobject.Getsing().F3 = new Form3();
}
private void Form4_FormClosing(object sender, FormClosingEventArgs e)
{
Singobject.Getsing().f4 = new Form4();
}
